Ojisan to Musume

Kazuha is an office worker who lives with an older man, Akitsu, a friend of her late mother's. Five years ago, Kazuha found herself alone without any relatives and, before she knew it, had developed feelings for Akitsu when he reached out a helping hand. Then he gets transferred to another city, and their cohabitation is called off!? "I don't want him to forget about me...!" When Kazuha pursues him, he...!? It may only be for one night, but her feelings won't stop overflowing...! A love story with a forbidden age difference.

(Source: Shogakukan, translated)